do you have twilight menu++ for your 3ds? or did you try doing a dsiware inject?
I tried twilight++, r4i card, nds bootstrapper.
Same here. Tried it on my 2ds with twilight menu and it just loaded a black screen.
Use the FAT Disabled version, and press Y while hovering over it on TWiLightMenu to change it to boot directly
Try to use the FAT disabled version. Worked for me